Adult Emerald Ash Borer (James E. Appleby, University of Illinois)
The State of Illinois is actively committed to fostering healthy, vigorous, high quality forests for the greatest good of society and the environment. Nevertheless, our trees and forest ecosystems are susceptible to a variety of native and exotic pests and pathogens, in addition to the seemingly more benign, but just as damaging effects of time, weather, and anthropogenic disturbances.
Illinois’ most notable biological forest health concerns range from insects including the emerald ash borer, gypsy moth, and Asian longhorned beetle; to pathogens such as oak wilt, ash-yellows, and miscellaneous wilts, cankers, and rots; to invasive and exotic species such as Eurasian honeysuckle, garlic mustard, and autumn olive. Additional forest health concerns that generally precede insect and disease events and often trigger general tree decline and mortality include over-stocked forest stands; senescent forest stands; flooding, draught, and storm damage; and anthropogenic disturbances such as herbicide drift and nutrient/pesticide runoff; ozone and acid rain; mechanical damage and soil compaction; and increased sedimentation, erosion, and altered hydrology from agricultural practices and general construction.
Shade Tree Advice
For community and private shade tree advice and assistance, please contact a certified arborist, city forester, Master Gardener, or your local Extension office. For technical assistance concerning prevention, detection, evaluation, and control measures for insect and disease outbreaks in your forest, please contact your local DNR forester.
Tissue or insect samples may be hand-delivered or mailed to the University of Illinois Plant Clinic in order to assist citizens and tree care specialists diagnose tree decline or identify damaging insects. Please refer to the Plant Clinic’s website for tissue and insect sample submission guidelines and fees.
Forest Health Newsletters
Emerald Ash Borer
Asian Longhorned Beetle
Sudden Oak Death
Identification and Treatment
- Canadian Forest Service, Insects and Diseases of Eastern Canada’s Forests
- Cornell University, Biological Control: A Guide to Natural Enemies in North America
- National Agricultural Pest Information System (NAPIS), Pest Tracker
- University of Illinois Extension, The Bug Review
- University of Illinois Home, Yard, and Garden Insects
- University of Illinois, Integrated Pest Management
- University of Illinois, Integrated Pest Management, Plant Disease Fact Sheets
- West Virginia University Extension Service, Insect Identification Online
USDA Forest Service Links
- USDA Forest Service Forest, Pest Alerts
- USDA Forest Service, Eastern Forest Insect and Disease Leaflets
- USDA Forest Service, Forest Health “How To” Publications
- USDA Forest Service, Forest Health Protection
- USDA Forest Service, Northeastern Area Forest Health Protection
- USDA Forest Service, Northeastern Area Forestry Publications
University of Illinois Plant Clinic
1401 W. St. Mary’s Street
Urbana, IL 61802
James E. Appleby, Ph.D.
Research Associate Professor of Forest Entomology
S517 Turner Hall, (MC047)
1102 South Goodwin Avenue
Urbana, Illinois 61801
Philip L. Nixon, Ph.D.
S408 Turner Hall, (MC047)
1102 South Goodwin Ave.
Urbana, Illinois 61801